Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 338
bserve that c, being themid-point of axa, must be the elevation of the minoraxis, the minor axis itself being a chord of that circularsection of the cone which has hk for its elevation. One-half of this circle is turned about HK until it is parallelto the vertical plane; its elevation then being…